To be fair, even though I disagree with Rockstar on removing them from the store, you can still play the originals if you already owned them on Steam. Unlike the recent scandal with Assassins Creed where they removed it from your Steam library.
Do you have a link with more information? Steam removed games that people legitimately purchased from their personal libraries?
The sad reality is that you purchased a license under terms that allow them to do whatever they want- it’s not really your personal library. Unless a government were to pass a law and fine them about it nothing will happen- it’s what you agreed to when you use services like Steam.
The desire the "purchase" games decreases with each passing day.